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Two-stage ignition and flame stabilisation in engine-relevant conditions. This project aims to reveal the mechanisms of ignition and flame stabilisation in the temperature and pressure conditions that exist in diesel engines, understanding of which is currently very limited despite their significant bearing on pollutants and fuel efficiency. Using massively parallel supercomputing resources, the most detailed, direct numerical simulations of ignition and flame stabilisation to date will be perfo ....Two-stage ignition and flame stabilisation in engine-relevant conditions. This project aims to reveal the mechanisms of ignition and flame stabilisation in the temperature and pressure conditions that exist in diesel engines, understanding of which is currently very limited despite their significant bearing on pollutants and fuel efficiency. Using massively parallel supercomputing resources, the most detailed, direct numerical simulations of ignition and flame stabilisation to date will be performed - they will be three-dimensional and use a detailed chemistry model able to account for low-temperature kinetics and two-stage ignition. Analysis of these data aims to reveal how ignition and flame stabilisation depends on key turbulence and chemical kinetic parameters, thus contributing to developing low-emissions diesel engines.Read moreRead less
Linkage Infrastructure, Equipment And Facilities - Grant ID: LE110100225
Funder
Australian Research Council
Funding Amount
$600,000.00
Summary
Multi-dimensional, high speed laser imaging facility for fluids and combustion. New high-speed laser diagnostics facilities will be established to enable Australian researchers to perform unique, real time measurements in combustion systems. Such novel capabilities will advance the science of combustion and facilitate the development of design tools for the optimisation of clean and efficient energy conversion devices.
Break-up and atomisation mechanisms in high pressure fuel sprays. The focus of this research is discovering the underlying mechanisms that give rise to the break-up and atomisation of high pressure sprays such as those found in many engines. The program of research makes use of a range of purpose designed experimental facilities and methodologies which are at the forefront of research in this area. The outcomes from this research will yield improved spray models giving rise to a new era of low e ....Break-up and atomisation mechanisms in high pressure fuel sprays. The focus of this research is discovering the underlying mechanisms that give rise to the break-up and atomisation of high pressure sprays such as those found in many engines. The program of research makes use of a range of purpose designed experimental facilities and methodologies which are at the forefront of research in this area. The outcomes from this research will yield improved spray models giving rise to a new era of low emission fuel injectors for diesel and possibly gas turbine engines.Read moreRead less
Fuel stratification to enable higher load operation of homogeneous charge compression ignition engines. The project aims to provide knowledge needed to solve a problem impeding the development of an efficient and clean engine concept known as homogeneous charge compression ignition. Fuel stratification using alternative fuels will be studied fundamentally and used to reduce the problematic rapid pressure changes that occur in these engines.
The stabilisation of lifted jet flames in hot oxidiser. The project will contribute fundamental insights on a crucial phenomenon in diesel engines: the detachment of the flame from the fuel nozzle, which strongly affects harmful emissions of nitrogen oxides (NOx) and particulates. Detailed numerical simulations will be used to reveal the mechanism of flame stabilisation, knowledge that will aid the development of cleaner engines.
Flame stabilisation and structure in axially staged combustion. We aim to improve fundamental understanding of flame stabilisation and structure in conditions relevant to axially staged combustion employed in gas turbines, in which an initial ultra-lean premixed stage is followed by a short residence time stage at higher equivalence ratios. This concept enables high turbine entry temperatures and thus high efficiency while limiting emissions of nitrogen oxides, and, importantly, enables improved ....Flame stabilisation and structure in axially staged combustion. We aim to improve fundamental understanding of flame stabilisation and structure in conditions relevant to axially staged combustion employed in gas turbines, in which an initial ultra-lean premixed stage is followed by a short residence time stage at higher equivalence ratios. This concept enables high turbine entry temperatures and thus high efficiency while limiting emissions of nitrogen oxides, and, importantly, enables improved operational flexibility in turndown and in burning fuels with different reactivities, such as hydrogen. This project will apply large-scale direct numerical simulations to advance fundamental understanding of this unusual combustion mode, and develop practical models able to predict its behaviour.Read moreRead less
Development of low emissions compression-ignition engines via ethanol port-injection dual-fuelling. The project aims to develop a more efficient and more cost-effective way of utilising clean-burning ethanol fuel. Port-injection fuelling of ethanol as a separate fuel stream in compression-ignition engines will be studied fundamentally and combined with novel combustion strategies to overcome problems that occur at high ethanol substitution.
Stability, transition and heat transfer in thermally coupled natural convection boundary layers. Thermally coupled natural convection systems occur when a conducting vertical wall separates two fluids at different temperatures. Such configurations occur, for example, at a window separating the interior of a room from the outside or when a container of fluid is placed in a refrigerator. Improved building heating/cooling and ventilation, and more efficient refrigeration systems, require a thoroug ....Stability, transition and heat transfer in thermally coupled natural convection boundary layers. Thermally coupled natural convection systems occur when a conducting vertical wall separates two fluids at different temperatures. Such configurations occur, for example, at a window separating the interior of a room from the outside or when a container of fluid is placed in a refrigerator. Improved building heating/cooling and ventilation, and more efficient refrigeration systems, require a thorough understanding and predictive capability for these flows. This project will develop experimental, numerical and analytic tools to predict these flows and provide simple scaling relations for bulk flow parameters such as the heat transfer across the wall, which will be of immediate use in the associated industries.Read moreRead less
Enhancement of Heat Transfer by Stimulated Transition to Turbulence in Natural Convection Boundary Layers on Heated Walls. The aim of this project is to increase the heat transfer from heated vertical surfaces to an ambient fluid by stimulating an early transition to turbulence. Such passive heat transfer occurs in heat transfer devices, natural ventilation systems and in many environmental settings. Enhanced heat transfer will greatly improve the performance of these systems. The project will ....Enhancement of Heat Transfer by Stimulated Transition to Turbulence in Natural Convection Boundary Layers on Heated Walls. The aim of this project is to increase the heat transfer from heated vertical surfaces to an ambient fluid by stimulating an early transition to turbulence. Such passive heat transfer occurs in heat transfer devices, natural ventilation systems and in many environmental settings. Enhanced heat transfer will greatly improve the performance of these systems. The project will provide the length scales, frequency and amplification rate for the occurence of the secondary spanwise mode that is the primary mechanism for turbulent transition. This will provide guidance for the development of appropriate roughness elements and heating length and time scales.Read moreRead less
Accelerating clean automotive innovation: fundamental insights into alternative fuel combustion. To achieve the maximum efficiency from alternatively fuelled engines, better understanding and predictive models are needed for the major limiting factor in spark-ignition engine efficiency: knock. The project will address this gap, thereby accelerating development of better engines and strengthening national capacity in clean engine technology.